main {
            font-family: sans-serif;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            height: 100vh;
            margin: 0;
            background-color: #f0f0f0;
        }

        canvas {
            border: 1px solid #ccc;
            background-color: #fff;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        .controls {
            margin-top: 20px;
        }
        button {
            font-size: 16px;
            padding: 10px 20px;
            margin: 0 10px;
            cursor: pointer;
            border: 1px solid #ddd;
            border-radius: 5px;
            background-color: #fff;
            transition: background-color 0.3s, box-shadow 0.3s;
        }
        button:hover {
            background-color: #e9e9e9;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }
        footer {
            text-align: center;
            padding: 20px;
            background-color: #333;
            color: #fff;
            position: relative;
        }